Osmosis Worksheet with animal cells in beakers of different concentrations, asking students to determine water movement, complete percentages, and classify solutions as isotonic, hypertonic, or hypotonic.

Osmosis Worksheet Solution

The worksheet involves analyzing the movement of water by osmosis between animal cells and their surrounding solutions. Here's how to solve each part step-by-step:

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#### Step 1: Understand the Basics
- Osmosis: The movement of water from an area of lower solute concentration (higher water concentration) to an area of higher solute concentration (lower water concentration) through a semipermeable membrane.
- Types of Solutions:
- Isotonic: Solute concentrations are equal inside and outside the cell; no net movement of water.
- Hypertonic: Higher solute concentration outside the cell; water moves out of the cell.
- Hypotonic: Lower solute concentration outside the cell; water moves into the cell.

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#### Step 2: Analyze Each Beaker

We will analyze each beaker one by one, comparing the solute concentrations inside the cell (circle) and outside the cell (beaker).

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##### Beaker 1
- Cell: 90% H₂O, 10% solute
- Solution: 85% H₂O, 15% solute
- Comparison: The solution is hypertonic (more solute outside the cell).
- Water Movement: Water moves out of the cell.
- Type of Solution: Hypertonic
- Arrow: ←

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##### Beaker 2
- Cell: 40% H₂O, 60% solute
- Solution: 90% H₂O, 10% solute
- Comparison: The solution is hypotonic (less solute outside the cell).
- Water Movement: Water moves into the cell.
- Type of Solution: Hypotonic
- Arrow: →

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##### Beaker 3
- Cell: 75% H₂O, 25% solute
- Solution: 80% H₂O, 20% solute
- Comparison: The solution is hypotonic (less solute outside the cell).
- Water Movement: Water moves into the cell.
- Type of Solution: Hypotonic
- Arrow: →

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##### Beaker 4
- Cell: 45% H₂O, 55% solute
- Solution: 75% H₂O, 25% solute
- Comparison: The solution is hypotonic (less solute outside the cell).
- Water Movement: Water moves into the cell.
- Type of Solution: Hypotonic
- Arrow: →

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##### Beaker 5
- Cell: 90% H₂O, 10% solute
- Solution: 63% H₂O, 37% solute
- Comparison: The solution is hypertonic (more solute outside the cell).
- Water Movement: Water moves out of the cell.
- Type of Solution: Hypertonic
- Arrow: ←

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##### Beaker 6
- Cell: 50% H₂O, 50% solute
- Solution: 50% H₂O, 50% solute
- Comparison: The solution is isotonic (equal solute concentrations).
- Water Movement: No net movement of water.
- Type of Solution: Isotonic
- Arrow: None

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##### Beaker 7
- Cell: 90% H₂O, 10% solute
- Solution: 25% H₂O, 75% solute
- Comparison: The solution is hypertonic (much more solute outside the cell).
- Water Movement: Water moves out of the cell.
- Type of Solution: Hypertonic
- Arrow: ←

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##### Beaker 8
- Cell: 82% H₂O, 18% solute
- Solution: 80% H₂O, 20% solute
- Comparison: The solution is hypertonic (slightly more solute outside the cell).
- Water Movement: Water moves out of the cell.
- Type of Solution: Hypertonic
- Arrow: ←

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##### Beaker 9
- Cell: 90% H₂O, 10% solute
- Solution: 80% H₂O, 20% solute
- Comparison: The solution is hypertonic (more solute outside the cell).
- Water Movement: Water moves out of the cell.
- Type of Solution: Hypertonic
- Arrow: ←

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#### Final Answer Summary

| Beaker | Arrow | Type of Solution |
|--------|-------|------------------|
| 1 | ← | Hypertonic |
| 2 | → | Hypotonic |
| 3 | → | Hypotonic |
| 4 | → | Hypotonic |
| 5 | ← | Hypertonic |
| 6 | None | Isotonic |
| 7 | ← | Hypertonic |
| 8 | ← | Hypertonic |
| 9 | ← | Hypertonic |

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Final Answer:

\boxed{
\begin{array}{c|c|c}
\text{Beaker} & \text{Arrow} & \text{Type of Solution} \\
\hline
1 & \leftarrow & \text{Hypertonic} \\
2 & \rightarrow & \text{Hypotonic} \\
3 & \rightarrow & \text{Hypotonic} \\
4 & \rightarrow & \text{Hypotonic} \\
5 & \leftarrow & \text{Hypertonic} \\
6 & \text{None} & \text{Isotonic} \\
7 & \leftarrow & \text{Hypertonic} \\
8 & \leftarrow & \text{Hypertonic} \\
9 & \leftarrow & \text{Hypertonic} \\
\end{array}
}